[Solved] Given this code snippet:DECLARE arr text[] := ARRAY['a', 'b', 'c']; output text := ''; BEGIN FOREACH ch IN ARRAY arr LOOP output := output || ch; END LOOP; RAISE NOTICE '%', output;... | PostgreSQL

PostgreSQL - PL/pgSQL Fundamentals

Given this code snippet:

DECLARE
  arr text[] := ARRAY['a', 'b', 'c'];
  output text := '';
BEGIN
  FOREACH ch IN ARRAY arr LOOP
    output := output || ch;
  END LOOP;
  RAISE NOTICE '%', output;
END;

What will be printed?

Aa b c

Ba,b,c

Cabc

DError: invalid concatenation

Step-by-Step Solution

Solution:

Step 1: Analyze FOREACH loop
Each element 'a', 'b', 'c' is concatenated without separator.
Step 2: Result string formation
Output becomes 'abc' as all letters join directly.
Final Answer:
abc -> Option C
Quick Check:
Concatenation without separator = 'abc' [OK]

Quick Trick: Concatenate inside FOREACH for joined string [OK]

Common Mistakes:

Expecting commas or spaces automatically
Thinking concatenation causes error
Assuming FOREACH adds separators

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Given this code snippet:

Step 1: Analyze FOREACH loop

Step 2: Result string formation

Final Answer:

Quick Check:

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